An analytical scheme developed for determination of PAH and aminoazaarenes has been applied to the analysis of aza-PAH formed in thermally treated high-protein food. The clean-up procedure, which was based on tandem solid-phase extraction (SPE) on columns filled with Extrelut diatomaceous earth and with cation exchanger (propylsulphonic acid, PRS), enabled selective isolation of carcinogenic az...

The total population of newly synthesized (32)P-AMP-rich RNA has been separated into two major types based on repeated fractionation on methylated albumin-kieselguhr columns. The purified D-RNA which elutes, under our experimental conditions, primarily in the salt gradient has a GMP/AMP ratio of about 0.8 and an AMP + UMP content of about 56 mole per cent. The purified TB-RNA which preferential...

The aim of this work was to apply some topological indices to predict chromatographic separations of selected bile acids such as: cholic (C), glycocholic (GC), glycodeoxycholic (GDC), chenodeoxycholic (CDC), deoxycholic (DC), lithocholic (LC) and glycolithocholic (GLC). The bile acids were separated on various glass and aluminum TLC plates precoated with silica gel only or with mixture of silic...

Optimal Node Placement in Underwater Wireless Sensor Network Muhamad Felemban Almost 70% of planet Earth is covered by water. A large percentage of underwater environment is unexplored. In the past two decades, there has been an increase in the interest of exploring and monitoring underwater life among scientists and in industry. Underwater operations are extremely difficult due to the lack of ...

Multiple functions of methyl-deficient tRNAMet, including those specific for initiator tRNA, were investigated and compared with normal tRNAMet. A comparison of the chromatographic properties of normal and methyl-deficient methionyl-tRNA showed identical elution profiles on methylated albumin-Kieselguhr, benzoylated o-(diethylaminoethyl)cellulose, and reverse phase chromatography (isoamylacetat...

34). Clayson (8) has pointed out that “. . . promoting agents must act by bringing about an increase in the number of precancerous or cancerous cells compared with the number of normal cells. . . .“While this selection for initiated cells may be accomplished in several different ways, a molecular basis for the selection is suggested based on the experiments described here. The process of pr...

This work concerns the use of analytical procedures to determine polycyclic aromatic hydrocarbons (PAH) in heat-treated meat dishes prepared under household cooking conditions. These compounds have not yet been analysed in food in Poland. Application of tandem solid-phase extraction (SPE) with columns filled with Extrelut diatomaceous earth and C18 phase, and column chromatography on silica gel...

This paper presents a study on the adsorption of basic dye, methylene blue, from an aqueous solution onto diatomaceous earth (diatomite). The effect of initial dye concentrations, adsorbent particle size and concentration, and agitation speed on adsorption was investigated. Adsorption isotherms obtained at different solutions temperatures revealed an irreversible adsorption with a capacity of 4...

Sulfur mustard agent (HD) (2,2'-dichloroethyl sulfide), a Schedule I compound on the Chemical Weapons Convention Schedule of Chemicals, remains a public health concern because it is simple to synthesize and it is in the chemical weapon stockpiles of several countries. A sensitive, rapid, accurate, and precise method was developed to quantitate trace levels of 1,1'-sulfonylbis [2-(methylthio) et...